What's a nice treat (non-packaged) for a deserving cat?

I see the pet treats in bags that have shelf-lives of three years and include high-fructose corn syrup. Is there something better that is real food?

Now we are settling for some very small bits of organic cheddar cheese (and what he sneaks from almost-empty soup bowls).

Sadly, the mice have disappeared for the season (unless they are in my car’s heating system.)